altruistic
adj.describing someone who does things for others without expecting anything in return. You use this to describe people who help others because they care, not because they want to get a reward.
adj.describing an action or quality that benefits others without any expectation of personal gain or reward. Often used to describe selfless behavior in social or biological contexts.
“She is very altruistic and always helps her neighbors.”
“The altruistic nature of the volunteers allowed the charity to continue its work without relying on government funding.”
“Evolutionary biologists often study altruistic behaviors to understand how cooperation can persist in a world where individuals must compete for limited resources.”
“For instance, while some people tend to be more altruistic, others are less prone to helping their friends, acquaintances or even complete strangers, particularly when it comes at a personal cost.”
From altruist + -ic. See altruism.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.